Hi Kevin.
Of course, when we say "the largest that will fit", one should always follow normal propellor fittng guidelines like these:
•The clearance between the tip of the prop and the hull should be 15% of propellor diameter. You can go down to 10% if you're stuck.
•The clearance between the rudder and the nearest point of the propeller be 15% of propellor diameter.
•The clearance between a full keel and the leading edge of the propeller, should be 30% of propellor diamter at half the radius from the shaft centerline.
•The clearance between the prop strut bearing and the propeller hub should be 1 -1.5x shaft diameter".
(from Yanmar Pleasure Boat Marine Engine Help)
However, you do have a point. Just because your can install it and it turns freely, it doesn't mean that the propellor fits.
So the guideline while converting to electric is to use the largest prop that will fit while following normal propellor fitting guidelines, or "the largest prop that will fit" for short.
Fair winds,
Eric
Marina del Rey, CA
PS. I bet that your foot can be put inside a size 15 shoe, that doesn't mean that the shoe fits.....
--- In electricboats@yahoogroups.com, Kevin Pemberton <pembertonkevin@...> wrote:
>
> There is more to prop size than the biggest that will fit. I think as I
> recall that clearance should be 10% of prop size. Otherwise it will
> effect running smoothness and maybe vibrations in the drivetrain.
> Someone can pipe in here.
>
> Kevin Pemberton
>
>
> On 06/21/2013 08:23 AM, jonathanheirendt wrote:
> >
> > Yes,
> > It is a 13x13. I was under the impression that with electric you can
> > and are supposed to use the biggest prop that will fit.
> >
> >
>
>
> --
> Committing murder in exchange for lifestyle
> makes you a "thug" not a "Rights Activist"
>
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